Re: [psycopg] Using infinite values with DateTimeTZRange

> While it is not an error to use 'infinity' or '-infinity' in a
> tstzrange, since those are acceptable timestamptz values, that is not
> the normal way to represent a range which extends infinitely in one
> direction. The normal way to represent a range with an infinite upper or
> lower bound is to omit the bound, as in '["2010-01-01 10:00:00 +01",]'.

Thanks for that - in my case I want to distinguish between cases where the end-date for a range is not known, and where
itjust been considered yet. The latter case I'm representing as a date-range without an upper bound, so thought
'infinity'was the best choice for where the end-date had been considered, but is unknown. 

Hope that reasoning makes sense, and if there's a better way to represent those two states then I'd be open to changing
that.

-- Felix
__________________________________
From: psycopg-owner@postgresql.org <psycopg-owner@postgresql.org> on behalf of Jonathan Rogers
<jrogers@emphasys-software.com>
Sent: 22 August 2017 16:19
To: psycopg@postgresql.org
Subject: Re: [psycopg] Using infinite values with DateTimeTZRange

On 08/20/2017 10:23 AM, Fennell, Felix W. wrote:
> Hi,
>
> Apologies if this isn’t the right place to ask questions like this but I am having difficulty storing ‘infinite’
datesusing the DateTimeTZRange object. 
>
> I have a Postgres database with a ‘tstzrange’ column (named validity) and I’d like to store a value in this similar
to‘[“2010-01-01 10:00:00 +01”, infinity]’. 

While it is not an error to use 'infinity' or '-infinity' in a
tstzrange, since those are acceptable timestamptz values, that is not
the normal way to represent a range which extends infinitely in one
direction. The normal way to represent a range with an infinite upper or
lower bound is to omit the bound, as in '["2010-01-01 10:00:00 +01",]'.

Read the manual for more detail:

https://www.postgresql.org/docs/current/static/rangetypes.html#RANGETYPES-INFINITE

--
Jonathan Rogers
Socialserve.com by Emphasys Software
jrogers@emphasys-software.com
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